Sea To Summit makes their premium silk traveling sheets from the strongest, finest ripstop silk available. The Premium Silk Mummy Liner with Hood and box foot is perfect for keeping a sleeping bag clean and for hostel or budget hotel traveling. Adds up to 10 degrees F / 6 degrees C of warmth Machine washable & colorfast Lightweight, super compact Packaged in its own stuff sack Double folded reinforced seams Material: AA Grade, 10-Momme ripstop silk Size:83" x 36" Weight: 4.9 oz.